If you downloaded Subtext last night and try to edit keywords in the admin section, you might run into a syntax error. I fixed the download so if the file you download is named
(notice the all caps "INSTALL") you have nothing to worry about.
If you downloaded
Then you might want to replace the EditKeywords.aspx file in the Admin folder with this one.
My apologies. I thought I had tested every page in the admin before releasing, but it was late and I must have missed this one. I never use that page day to day so my dogfooding attempts surely missed it.